Checkbox toggle shortcut

[mikailcf]

• [x] I understand that contributing to this repository will require me to agree with the CLA

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Description

What

This PR adds a new shortcut for checking/unchecking checkboxes and suggests a change to the shortcut for expanding/collapsing toggles for both to be the same.

Why

It's very practical to be able to mark checkbox items in a list when you can do that directly from the keyboard in a text heavy application.

The suggestion for the toggle shortcut is to keep both equal, since they both have similar effects, and with easier access. Since cmd + enter wasn't being currently used in Anytype and other similar apps in the market use that combination, I thought it would make sense.

What type of PR is this? (check all applicable)

• [x] 🍕 Feature
• [ ] 🐛 Bug Fix
• [ ] 📝 Documentation Update
• [ ] 🎨 Style
• [ ] 🧑‍💻 Code Refactor
• [ ] 🔥 Performance Improvements
• [ ] ✅ Test
• [ ] 🤖 Build
• [ ] 🔁 CI

Added tests?

• [ ] 👍 yes
• [x] 🙅 no, because they aren't needed
• [ ] 🙋 no, because I need help

Added to documentation?

• [ ] 📜 README.md
• [ ] 📓 tech-docs
• [ ] 🙅 no documentation needed

[fuksman]

@any contributor @mikailcf code